272 DESCRIPTION OF A NEW DIPLOCREPIS FROM PORT JACKSON. 



From Richardson's fish it difi'ers greatly in the number of rays 

 in the vertical fins, the naiTOwness of the head, the smaller eye, 

 the position of the dorsal and anal fins, the shape of the plates on, 

 and small size of, the disk, the position of the vent, and the 

 coloration. Its sti'ong dentition separates it at once from Crepi- 

 dogaster and Trachelochismus, but curiously enough its fin formula 

 is similar to that of the latter, from which however it difi'ers 

 greatly in the shape of the head, &c. It is very interesting to 

 observe how our east coast species possess greater affinities to the 

 two New Zealand than to the more southern and western Crepi- 

 dogaster 



Since writing the above 1 have found a much smaller example, 

 but 1-^- inches long, in which the fin formula, measurements, and 

 general characters exactly correspond with those of the larger 

 individual. Registered number of type B. 7140. 



